<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<style>
		body {
			padding: 0;
			margin: 0;
		}

		.b {
			width: 200px;
			height: 200px;
			border: 1px solid red;
			margin-top: 90px;
		}

		.a {
			background-color: forestgreen;
			height: 300px;
			width: 220px;
		}

		.c {
			background-color: red;
			height: 10px;
		}
	</style>
	<body>
		<div class="a">
			<div class="b"></div>
			<div class="c"></div>
		</div>
	</body>
</html>
